🚀 go-pugleaf

On a related (well, sort of) note, regarding Electronic Guitar Tuning,
that was precicely what our first Electronic Design project was this quarter.

And let me tell you, that it is mucho difficult to quantify a vibrating 
guitar string without resorting to DSP technology (we were using strict
analog).

It was basically a mic, and amp, a filter to get rid of hi-freq garbage,
and then the most futile attempt at a half-a-dozen methods to get a good
signal to send to a freq-voltage converter (to determine if a string is
in tune or not).

Depending on 1) how the string was plucked, 2) where it was plucked,
3) how hard it was plucked, 4) how in-tune it already was,  and 5) the
phase of the moon, we got different results. Harmonics were popping in
and out of the signal as the string amplitude diminished, and I can under-
stand 1), 2) and 3) for this cause.

Most surprizing was 4): Apparently there are natural harmonic resonating
frequencies of the body of the guitar which heighten or dampen various
harmonics. It also changed depending on how I dampened the vibration of
the guitar with my body.

All in all, a very frustrating project!  Now to write up the report and explain
why it didn't work 100%....


			Steven Christensen
			Univ. of Cincinnati

-- 
Steven V. Christensen
U.C. College of Eng.
schriste@uceng.uc.edu
For the adventurous: svc@elf0.uucp